66221852 has 12 divisors (see below), whose sum is σ = 116263056. Its totient is φ = 33003840.

The previous prime is 66221789. The next prime is 66221861. The reversal of 66221852 is 25812266.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25373 + ... + 27860.

It is an arithmetic number, because the mean of its divisors is an integer number (9688588).

Almost surely, 2^66221852 is an apocalyptic number.

It is an amenable number.

66221852 is a deficient number, since it is larger than the sum of its proper divisors (50041204).

66221852 is a wasteful number, since it uses less digits than its factorization.

66221852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53548 (or 53546 counting only the distinct ones).

The product of its digits is 11520, while the sum is 32.

The square root of 66221852 is about 8137.6809964510. The cubic root of 66221852 is about 404.5763023108.

The spelling of 66221852 in words is "sixty-six million, two hundred twenty-one thousand, eight hundred fifty-two".